Calculus Examples

$\frac{3 e^{x}}{5 e^{x} - 8}$

Step 1

Since $3$ is constant with respect to $x$ , the derivative of $\frac{3 e^{x}}{5 e^{x} - 8}$ with respect to $x$ is $3 \frac{d}{d x} [\frac{e^{x}}{5 e^{x} - 8}]$ .

$3 \frac{d}{d x} [\frac{e^{x}}{5 e^{x} - 8}]$

Step 2

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = e^{x}$ and $g (x) = 5 e^{x} - 8$ .

$3 \frac{(5 e^{x} - 8) \frac{d}{d x} [e^{x}] - e^{x} \frac{d}{d x} [5 e^{x} - 8]}{{(5 e^{x} - 8)}^{2}}$

Step 3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} \frac{d}{d x} [5 e^{x} - 8]}{{(5 e^{x} - 8)}^{2}}$

Step 4

Differentiate.

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Step 4.1

By the Sum Rule, the derivative of $5 e^{x} - 8$ with respect to $x$ is $\frac{d}{d x} [5 e^{x}] + \frac{d}{d x} [- 8]$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} (\frac{d}{d x} [5 e^{x}] + \frac{d}{d x} [- 8])}{{(5 e^{x} - 8)}^{2}}$

Step 4.2

Since $5$ is constant with respect to $x$ , the derivative of $5 e^{x}$ with respect to $x$ is $5 \frac{d}{d x} [e^{x}]$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} (5 \frac{d}{d x} [e^{x}] + \frac{d}{d x} [- 8])}{{(5 e^{x} - 8)}^{2}}$

Step 5

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} (5 e^{x} + \frac{d}{d x} [- 8])}{{(5 e^{x} - 8)}^{2}}$

Step 6

Differentiate using the Constant Rule.

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Step 6.1

Since $- 8$ is constant with respect to $x$ , the derivative of $- 8$ with respect to $x$ is $0$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} (5 e^{x} + 0)}{{(5 e^{x} - 8)}^{2}}$

Step 6.2

Simplify the expression.

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Step 6.2.1

Add $5 e^{x}$ and $0$ .

$3 \frac{(5 e^{x} - 8) e^{x} - e^{x} (5 e^{x})}{{(5 e^{x} - 8)}^{2}}$

Step 6.2.2

Multiply $5$ by $- 1$ .

$3 \frac{(5 e^{x} - 8) e^{x} - 5 e^{x} e^{x}}{{(5 e^{x} - 8)}^{2}}$

Step 7

Multiply $e^{x}$ by $e^{x}$ by adding the exponents.

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Step 7.1

Move $e^{x}$ .

$3 \frac{(5 e^{x} - 8) e^{x} - 5 (e^{x} e^{x})}{{(5 e^{x} - 8)}^{2}}$

Step 7.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$3 \frac{(5 e^{x} - 8) e^{x} - 5 e^{x + x}}{{(5 e^{x} - 8)}^{2}}$

Step 7.3

Add $x$ and $x$ .

$3 \frac{(5 e^{x} - 8) e^{x} - 5 e^{2 x}}{{(5 e^{x} - 8)}^{2}}$

Step 8

Combine $3$ and $\frac{(5 e^{x} - 8) e^{x} - 5 e^{2 x}}{{(5 e^{x} - 8)}^{2}}$ .

$\frac{3 ((5 e^{x} - 8) e^{x} - 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9

Simplify.

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Step 9.1

Apply the distributive property.

$\frac{3 (5 e^{x} e^{x} - 8 e^{x} - 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.2

Apply the distributive property.

$\frac{3 (5 e^{x} e^{x}) + 3 (- 8 e^{x}) + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3

Simplify the numerator.

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Step 9.3.1

Simplify each term.

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Step 9.3.1.1

Multiply $e^{x}$ by $e^{x}$ by adding the exponents.

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Step 9.3.1.1.1

Move $e^{x}$ .

$\frac{3 (5 (e^{x} e^{x})) + 3 (- 8 e^{x}) + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.1.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{3 (5 e^{x + x}) + 3 (- 8 e^{x}) + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.1.1.3

Add $x$ and $x$ .

$\frac{3 (5 e^{2 x}) + 3 (- 8 e^{x}) + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.1.2

Multiply $5$ by $3$ .

$\frac{15 e^{2 x} + 3 (- 8 e^{x}) + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.1.3

Multiply $- 8$ by $3$ .

$\frac{15 e^{2 x} - 24 e^{x} + 3 (- 5 e^{2 x})}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.1.4

Multiply $- 5$ by $3$ .

$\frac{15 e^{2 x} - 24 e^{x} - 15 e^{2 x}}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.2

Combine the opposite terms in $15 e^{2 x} - 24 e^{x} - 15 e^{2 x}$ .

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Step 9.3.2.1

Subtract $15 e^{2 x}$ from $15 e^{2 x}$ .

$\frac{0 - 24 e^{x}}{{(5 e^{x} - 8)}^{2}}$

Step 9.3.2.2

Subtract $24 e^{x}$ from $0$ .

$\frac{- 24 e^{x}}{{(5 e^{x} - 8)}^{2}}$

Step 9.4

Move the negative in front of the fraction.

$- \frac{24 e^{x}}{{(5 e^{x} - 8)}^{2}}$